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How to enable flash dual bank

Some devices like the STM32F76x support the Flash Dual Bank mode.

Follow these steps to enable it:

- Enable the Flash Dual Bank option bytes using the STM32 STLink-Utility software

The STM32 STLink-Utility software can be downloaded here:
http://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/stsw-link004.html

uncheck the nDBANK box:
/media/uploads/bcostm/dual_bank_ob.png

Click on Apply and then exit the software.

- Enable the FLASH_DUAL_BANK configuration in the code using either the targets.json or mbed_app.json files.

If you modify the targets.json file, you need to set the flash_dual_bank configuration to 1. Note that this configuration is only available on the platforms that support the dual bank (STM32F76x).

i.e.

"flash_dual_bank": {
  "help": "Default board configuration is Single Bank Flash. If you enable Dual Bank with ST Link Utility, set value to 1",
  "value": "1"
},

If you use a mbed_app.json file, add the below lines (example for NUCLEO_F767ZI platform):

"target_overrides": {
    "NUCLEO_F767ZI":  {
        "flash_dual_bank": "1"
    }
}

Rebuild your code and reprogram your platform.

- You may need also to upgrade the STLink fw on the board to the latest version (V2.J30.M21 as of today) because oldest versions didn't support the drag&drop in dual flash mode.


See the mbed-cli documentation for more information on the configuration system syntax.

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